Hi,
I fetch and read the RRG for SB700, found PMIO_REG74 is PwrFailShadow.
for SB800 there is no PwrFailShadow any more, instead AMD give it a
new, nonsense name, RtcShadow / RtcShawdow (typo?) and put it to
PMIO_REG5B. Sucks.
I download SB800 BDG following URL in coreboot Wiki, PN is
"45483_sb800_bdg_pub_3.02".
I check the SB900 code and there is a function AcLossControl(), which
used RtcShadow to control "System Restart after Power Fail".
So I guess the BDG v3.02 for SB800 (3.6, P20) is a mistake. Maybe
someone copy & paste it from SB700 Guide (in a bugfix , Rev. 1.01,
ha ha!)
Anyway I change
const static AcpiRegWrite sbPmioPorInitTable[] = {
... ...
{PMIO_BASE >> 8, SB_PMIOA_REG5B, 0xF9, BIT1 + BIT2},
... ...
}
to
1) {PMIO_BASE >> 8, SB_PMIOA_REG5B, 0xF0, BIT0 + BIT2},
2) {PMIO_BASE >> 8, SB_PMIOA_REG5B, 0xF0, BIT0 + BIT2 + BIT3},
both still does not work and I had to press POWER button.
Any idea?
Thanks,
mopz0506
On Sat, Oct 15, 2011 at 9:57 AM, mopz0506 mopz0506 <mopz0506 at gmail.com> wrote:
> Hi,
>> My mainboard is ASRock E350M1, it's sourthbridge is AMD SB800.
>> I want the machine to restart once I connect the power cable to
> it, without press the POWER button on the front panel.
>> The ASRock's EFI BIOS can do this by set "Always Power On" to
> "enable".
>> At present the coreboot (the cimx module) seems does not touch
> "System Restart after Power Fail" feature.
>> If I use vendor's EFI BIOS and set "always restart after the
> power is restored", then flash the coreboot to it, the box always
> restart when power connected and I need not to press the POWER
> button.
>> If I use vendor's EFI BIOS and set "keep power off after the
> power is restored", then flash the coreboot to it, the box does
> not up and I must press the POWER button.
>> If I clear the BIOS by connect the jumper to (pin1 - pin2), then
> all setting lost and I must press the POWER button.
>> So seems the coreboot just use the setting (but never set it).
>> I think the code is in src\vendorcode\amd\cimx\sb800\SBPOR.c
>> const static AcpiRegWrite sbPmioPorInitTable[] =
> ......
> {PMIO_BASE >> 8, SB_PMIOA_REG74, 0xF6, BIT0 + BIT3},
> ......
> }
>> and yes it does not touch the BIT1.
>> The BIOS Developer's Guide 3.6, P20, said I must to set
> PMIO 74h [bits 1:0] to [01b] to get "always power on" working.
> [00] / [10] / [11] does not work as what I hope.
>> So I change the line to always clean BIT1 to 0, as BDG required,
>> {PMIO_BASE >> 8, SB_PMIOA_REG74, 0xF4, BIT0 + BIT3},
>> (just for test, I think the proper way is give a
> pConfig->OEMPROGTBL.OemProgrammingTablePtr_Ptr to overwrite
> CIMX's default setting)
>> but it has no effect, the box keep off until I press POWER button.
>> before this code PMIO 24h [AcpiMMioEn] has been enabled so
> MMIO working.
>> I checked the SB700 code src\southbridge\amd\sb700\sm.c, to see
> how coreboot set "power_on_after_fail" bit in other chipset.
>> =================== code start =================
> /* power after power fail */
>> on = CONFIG_MAINBOARD_POWER_ON_AFTER_POWER_FAIL;
>> get_option(&on, "power_on_after_fail");
>> byte = pm_ioread(0x74);
>> byte &= ~0x03;
>> if (on) {
> byte |= 2;
> }
>> byte |= 1 << 2;
>> pm_iowrite(0x74, byte);
>> printk(BIOS_INFO, "set power %s after power fail\n", on ? "on" : "off");
> =================== code end =================
>> what it did is a litter different and always set bit0 to 0 (CIMX set bit0
> to 1, which is required by the manual):
>> 1) clear bit[1:0] to [00b]
> 2) set bit[1] to [1b]
> 3) set bit[2] to [1b]
>> I don't know this code working or not since I do not own a SB700 mainboard.
>> If I did it on SB800 as below
>> {PMIO_BASE >> 8, SB_PMIOA_REG74, 0xFC, BIT1 + BIT2},
>> coreboot fail to boot.
>> SB800 obsolete those coreboot code and replace it with new CIMX code.
>> I read the documents about all PM registers, and found nothing.
> I search "power" in the whole .pdf, but most of them is difficult to
> understand for me.
> I search the archive of mail list and seems every mainboard has different
> method to set this feature.
>> I had tried set it on superio code (Winbond W83267hf), and does not work.
>> Also I observe that BIT0 is "Decen_acpi", and BIT1 is "Gbl_en_en", and
> they are not "power on after power fail" bit.
>> Did I did anything wrong?
>> Did these bits need some ACPI code to working?
>> When the power cable connected, before I press the POWER button, the
> mainboard keeps off due to the setting. in this case, the BIOS code
> running or not?
>> Any suggesting?
>> Thanks for your help in advance,
>> mopz0506
>